Abstract：The LCL grid-connected inverters have become an important topology structure for eliminating high-order harmonics, and become a research hotspot for scholars at home and abroad. When the topology and modulation strategy are determined, the decoupling control of the system becomes the decisive factor for the stability and performance of the system. This paper discusses the limitations of traditional single control strategy in LCL grid-connected inverters, the advantages of compound control strategy and the advantages and disadvantages of different combinations of two kinds of compound control. The internal control mechanism of parallel compound control proportion-integral (PI) ＋ repeat-control (RC) is analyzed, and the influence of coupling degree on the system is reduced by adjusting the parameters of PI control.
标题：并网逆变系统的复合控制技术研究
title:Compound Control Technology of Grid-Connected Inverter System
